Question: Who was the chairperson of the Communist Party of China immediately before Hu Yaobang and who succeeded him?
Paraphrase: Who used to be the chairperson of the Communist Party of China right now before Hu Yaobang and who succeeded him?
SPARQL (Wikidata): SELECT ?value1 ?value2 WHERE { wd:Q17427 p:P488 ?s . ?s ps:P488 wd:Q99850 . ?s pq:P156 ?value1 . ?s pq:P155 ?value2 }